diff options
Diffstat (limited to 'drivers/clk/at91/clk-master.c')
| -rw-r--r-- | drivers/clk/at91/clk-master.c | 68 |
1 files changed, 43 insertions, 25 deletions
diff --git a/drivers/clk/at91/clk-master.c b/drivers/clk/at91/clk-master.c index 620ea323356b..8d94ddfc9c72 100644 --- a/drivers/clk/at91/clk-master.c +++ b/drivers/clk/at91/clk-master.c @@ -19,6 +19,8 @@ #include <linux/sched.h> #include <linux/interrupt.h> #include <linux/irq.h> +#include <linux/mfd/syscon.h> +#include <linux/regmap.h> #include "pmc.h" @@ -44,7 +46,7 @@ struct clk_master_layout { struct clk_master { struct clk_hw hw; - struct at91_pmc *pmc; + struct regmap *regmap; unsigned int irq; wait_queue_head_t wait; const struct clk_master_layout *layout; @@ -60,15 +62,24 @@ static irqreturn_t clk_master_irq_handler(int irq, void *dev_id) return IRQ_HANDLED; } + +static inline bool clk_master_ready(struct regmap *regmap) +{ + unsigned int status; + + regmap_read(regmap, AT91_PMC_SR, &status); + + return status & AT91_PMC_MCKRDY ? 1 : 0; +} + static int clk_master_prepare(struct clk_hw *hw) { struct clk_master *master = to_clk_master(hw); - struct at91_pmc *pmc = master->pmc; - while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MCKRDY)) { + while (!clk_master_ready(master->regmap)) { enable_irq(master->irq); wait_event(master->wait, - pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MCKRDY); + clk_master_ready(master->regmap)); } return 0; @@ -78,7 +89,7 @@ static int clk_master_is_prepared(struct clk_hw *hw) { struct clk_master *master = to_clk_master(hw); - return !!(pmc_read(master->pmc, AT91_PMC_SR) & AT91_PMC_MCKRDY); + return clk_master_ready(master->regmap); } static unsigned long clk_master_recalc_rate(struct clk_hw *hw, @@ -88,18 +99,16 @@ static unsigned long clk_master_recalc_rate(struct clk_hw *hw, u8 div; unsigned long rate = parent_rate; struct clk_master *master = to_clk_master(hw); - struct at91_pmc *pmc = master->pmc; const struct clk_master_layout *layout = master->layout; const struct clk_master_characteristics *characteristics = master->characteristics; - u32 tmp; + unsigned int mckr; - pmc_lock(pmc); - tmp = pmc_read(pmc, AT91_PMC_MCKR) & layout->mask; - pmc_unlock(pmc); + regmap_read(master->regmap, AT91_PMC_MCKR, &mckr); + mckr &= layout->mask; - pres = (tmp >> layout->pres_shift) & MASTER_PRES_MASK; - div = (tmp >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK; + pres = (mckr >> layout->pres_shift) & MASTER_PRES_MASK; + div = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK; if (characteristics->have_div3_pres && pres == MASTER_PRES_MAX) rate /= 3; @@ -119,9 +128,11 @@ static unsigned long clk_master_recalc_rate(struct clk_hw *hw, static u8 clk_master_get_parent(struct clk_hw *hw) { struct clk_master *master = to_clk_master(hw); - struct at91_pmc *pmc = master->pmc; + unsigned int mckr; + + regmap_read(master->regmap, AT91_PMC_MCKR, &mckr); - return pmc_read(pmc, AT91_PMC_MCKR) & AT91_PMC_CSS; + return mckr & AT91_PMC_CSS; } static const struct clk_ops master_ops = { @@ -132,7 +143,7 @@ static const struct clk_ops master_ops = { }; static struct clk * __init -at91_clk_register_master(struct at91_pmc *pmc, unsigned int irq, +at91_clk_register_master(struct regmap *regmap, unsigned int irq, const char *name, int num_parents, const char **parent_names, const struct clk_master_layout *layout, @@ -143,7 +154,7 @@ at91_clk_register_master(struct at91_pmc *pmc, unsigned int irq, struct clk *clk = NULL; struct clk_init_data init; - if (!pmc || !irq || !name || !num_parents || !parent_names) + if (!name || !num_parents || !parent_names) return ERR_PTR(-EINVAL); master = kzalloc(sizeof(*master), GFP_KERNEL); @@ -159,7 +170,7 @@ at91_clk_register_master(struct at91_pmc *pmc, unsigned int irq, master->hw.init = &init; master->layout = layout; master->characteristics = characteristics; - master->pmc = pmc; + master->regmap = regmap; master->irq = irq; init_waitqueue_head(&master->wait); irq_set_status_flags(master->irq, IRQ_NOAUTOEN); @@ -217,7 +228,7 @@ out_free_characteristics: } static void __init -of_at91_clk_master_setup(struct device_node *np, struct at91_pmc *pmc, +of_at91_clk_master_setup(struct device_node *np, const struct clk_master_layout *layout) { struct clk *clk; @@ -226,6 +237,7 @@ of_at91_clk_master_setup(struct device_node *np, struct at91_pmc *pmc, const char *parent_names[MASTER_SOURCE_MAX]; const char *name = np->name; struct clk_master_characteristics *characteristics; + struct regmap *regmap; num_parents = of_clk_get_parent_count(np); if (num_parents <= 0 || num_parents > MASTER_SOURCE_MAX) @@ -239,11 +251,15 @@ of_at91_clk_master_setup(struct device_node *np, struct at91_pmc *pmc, if (!characteristics) return; + regmap = syscon_node_to_regmap(of_get_parent(np)); + if (IS_ERR(regmap)) + return; + irq = irq_of_parse_and_map(np, 0); if (!irq) goto out_free_characteristics; - clk = at91_clk_register_master(pmc, irq, name, num_parents, + clk = at91_clk_register_master(regmap, irq, name, num_parents, parent_names, layout, characteristics); if (IS_ERR(clk)) @@ -256,14 +272,16 @@ out_free_characteristics: kfree(characteristics); } -void __init of_at91rm9200_clk_master_setup(struct device_node *np, - struct at91_pmc *pmc) +static void __init of_at91rm9200_clk_master_setup(struct device_node *np) { - of_at91_clk_master_setup(np, pmc, &at91rm9200_master_layout); + of_at91_clk_master_setup(np, &at91rm9200_master_layout); } +CLK_OF_DECLARE(at91rm9200_clk_master, "atmel,at91rm9200-clk-master", + of_at91rm9200_clk_master_setup); -void __init of_at91sam9x5_clk_master_setup(struct device_node *np, - struct at91_pmc *pmc) +static void __init of_at91sam9x5_clk_master_setup(struct device_node *np) { - of_at91_clk_master_setup(np, pmc, &at91sam9x5_master_layout); + of_at91_clk_master_setup(np, &at91sam9x5_master_layout); } +CLK_OF_DECLARE(at91sam9x5_clk_master, "atmel,at91sam9x5-clk-master", + of_at91sam9x5_clk_master_setup); |